The Liverpool defender limped off during a pre-season friendly against Roma in St. Louis with a hamstring problem that sparked fears he could miss the start of the season.

But after being assessed by medics, the Spanish left-back was adjudged to have suffered no more than a minor injury, and Klopp – who has serious defensive problems just 11 days before the start of the season - said: “Alberto has a dead leg in his hamstring, that's all.

ST LOUIS, MO - AUGUST 01: (THE SUN OUT, THE SUN ON SUNDAY OUT) Jurgen Klopp manager of Liverpool shows his appreciation to the fans at the end of the friendly match between AS Roma and Liverpool and at Busch Stadium on August 1, 2016 in St Louis, Missouri. (Photo by Andrew Powell/Liverpool FC via Getty Images) (Photo: Liverpool FC via Getty)

"The good news is we have no problems – I am happy that no one is injured, because it was difficult to play for my team, after the intensity of the tour."

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Klopp admitted that his side were far from their best as they went down 2-1 to a lively Roma side, but he believes that was purely because of their intense schedule, which saw them play twice in three days... and do full training session in between.

"It wasn't our best game but that can happen when you aren't compact like in the first half," Klopp added.

“We had a lot of good chances too. It could have been 6-5 at half-time.

"It was exciting for the supporters but not what I wanted.

"I can accept it because I know why. We've had 13 days in the USA and the hardest circumstances tonight.

ST. LOUIS, MO - AUGUST 1: (THE SUN OUT, THE SUN ON SUNDAY OUT) Jordan Henderson #14 of Liverpool FC and Leandro Paredes #5 of AS Roma during a pre-season friendly at Busch Stadium on August 1, 2016 in St. Louis, Missouri. (Photo by Andrew Powell/Liverpool FC via Getty Images) (Photo: Liverpool FC via Getty)

ST. LOUIS, MO - AUGUST 1: (THE SUN OUT, THE SUN ON SUNDAY OUT) Adam Lallana #20 of Liverpool FC prepares for a corner kick during a pre-season friendly against AS Roma at Busch Stadium on August 1, 2016 in St. Louis, Missouri. (Photo by Andrew Powell/Liverpool FC via Getty Images) (Photo: Liverpool FC via Getty)

"A lot of intensive sessions and then playing in that heat tonight.

"We've had a lot of games in the last few weeks and our opponent has had no games for two weeks so it was hard.

"Of course we have to do better. It was easy to see what was wrong so it's easy to change it."